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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        //斐波那契数列
        function Fib(n){
            if(n == 1 || n == 2){
                return 1;
            }
            return Fib(n - 1) + Fib(n - 2);
        }
        var res = Fib(6);
        console.log(res);
        
    </script>
</body>
</html>